Fewer than 2 percent of the 47,000 members of the United States Chess Federation are masters — and just 13 of them are under the age of 14.

Among that select group of prodigies are three black players from the New York City area — Justus Williams, Joshua Colas and James Black Jr. — who each became masters before their 13th birthdays.

“Masters don’t happen every day, and African-American masters who are 12 never happen,” said Maurice Ashley, 45, the only African-American to earn the top title of grandmaster. “To have three young players do what they have done is something of an amazing curiosity. You normally wouldn’t get something like that in any city of any race.”

The chess federation, the game’s governing body, does not keep records on the ethnicity of its members. But a Web site called the Chess Drum — which chronicles the achievements of black chess players and is run by Daaim Shabazz, an associate professor of business at Florida A&M University — lists 85 African-American masters. Shabazz said many of them no longer compete regularly.